Resume, Service
ARCO Publishing Company, Inc., 1967
Buku Teks
Betof, Edward, author
American Society for Training & Development, 2009
eBooks
Tracy, Brian, author
Amacom, 2011
Buku Teks
Paulus Winarno, author
Gramedia, 2005
Buku Teks
Kern, M. Kathleen, author
[American Management Association, ], 2009
eBooks